Have smartphone ? Suggest photo every page of logbook(s) as a backup.
I was in similar situation... After some Flying Scholarship & JP hours both civilian & Service flying logbooks despatched from Biggin Hill mailroom to FTS for JP hours/exercises to be validated by Chief Instructor in civvy logbook.
That was early 1987. Both logbooks lost until dropped onto my doormat in late 1999 more than 12 years later & 6 years since I'd left the RAF !
What about NPPL ?
http://www.nationalprivatepilotslice...20REV%2009.pdf